Roller-base lifting jack



T. M. AVERY.

ROLLER BASE LIFTING JACK.

APPLICATION FILED JUNE 16, I919.

Patented May 16, 1922.

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ROLLER BASE unme JAC K. APPLICATION ElLED JUNE 16, 1919- 1,415 ,857. Patented May 16, 1922.

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ROLLER BASE LIFTING JACK.

APPLICATION FILED was 16, 1919.

Patented May 16, 19 22.

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witness T. M. AVERY. R OLLER BASE LI-FTING JACK. APPLICATION FILED JUNE 16, I919.

1,415,357. Patented May 16, 192a 61 9 V Q 1 aw 0 W 16 J0 J1? I UNITED STATES PATENT errce? TRUE 1!, AVERY, OI GLENS FALLS, NEW ASSIGNO'B TO ARROW-GRIP MANU- FACTURING 60., INC GLENS FALLS, NEW YORK, A OQBZPORATION OF- NEW YORK.

'Be it known that-I, TRUE M. AVERY, a

citizen of the United States, residing at Glens Falls, inthe county of Warren and State of New York, have invented new and useful Improvements in Roller-Base Lifting Jacks, of which the following is a specification.

This invention relates to improvements in lifting jacks, proposing a construction espe cially useful in connection with work on automobiles and of the broad or general type which embodies roller supporting means movable relativel to the base and resilient means acting on t e roller supporting means and the lease. In such type of construction the elements specified are so combined and arranged. that the roller supporting means normally acts on the ground and the jack and base derive their normal support from the roller supporting means and are non mally held above or free from the ground, thus providing for the eas transportation or manipulation of the jac in placing the same beneath the axle or other load to be lifted or while removing the same from the operating position, but permitting the base to move downward relative to the roller supportingmeans into positive and direct enga ement with the ground when the load is rought to bear upon the jack, the resilient means acting automatically to restore the roller supporting means to normal or jack-supportin position when the load is relieved from the jack.

The principal objects of the invention, briefly stated, are to improve a jack of the type referred to in respect of compactness,

simplicity of structure, durability, strength,

and manufacturing facility and economy.

With the above'objects in view the invention consists in certain novel features of structure and arrangement appertaining to the mounting of the roller supporting means and the resilient. elements and to the form and details of the base as correlated to said rollers and elements. A jack in accordance with the invention is essentially character ized by vertically movable axles carrying the roller supporting means, the construction of the base for stable engagement with the ground and with parts internally arranged to provide vertical guides for cooperation with the axles to rescribe their movements as rectilinear an preferably to Specification 6: mm; Patent. P t t May 1 Application filed June 16, 191B. Serial No; 304,546.

Roma-Bass mrrme JACK.

center the springs by which the supporting rollers are normally projected, and means ad acent said guides against which the axles normally rest, These features and the details of structure and arrangement appurtenant thereto will be set forth at length as the description proceeds.

Embodiments of the invention are illustrated in the accompanying drawings, wherein:

Figure l isa verticallongitudinal sectional view of a jack in which the features of theinvention are incorporated, the construction here shown being preferred, as now considered. I

Figure 2 is a detail vertical longitudinal Sectional view of the upper element or cover of the base.

Figure El is an inverted plan view of the Figure 5 is a view part in side elevation I and partly in vertical longitudinal section of the lower element or bottom of the base.

Figure 6 is a detail cross-sectional view on the line 6-+6 of Figure l.

Figure 7 is a vertical longitudinal sectional view showing an alternative construction of the base feature of the jack.

Figure 8 is a bottom plan view of the up or element or cover of the base shown in igure 7.

Figure 9 is a plan view of the lower ment or bottom of the base shown in Figure 7.

Similar characters of reference designate corresponding parts throughout the several views.

The jack proper may be of any suitable design and construction. As shown, it comprises an operating screw 1 working within an upright casing 2 and co-operating with a nut 3, which travels lengthwise of said casing and is formed at the lower end of a hollow column 4; into which the screw projects,

ele- 'The nut 3 is non-rotatable and co-operates with the casing 2 as a guide, said casing and nut preferably having conforming square cross-sections.

either direction the nut, and with 1t the As the screw 1 is turned in base and associated elements thereof which form the subject of the present invention.

The base includes an u per member or cover 10 and, preferably, a ower member or bot- '.'tom 11 secured in spaced relation to said cover. The interior of the base is preferably completely enclosed and for this purpose one of its essential arts, in this instance the cover 10, is provided with vertical walls 12 delimiting a rectangular enclosure and extending between the cover and bottom.

The jack is normally supported by roller supporting means, 1. e. rollers 13, of wh 1ch there are preferably four, these pro ecting below the base and, in the present embodiment, working through clearances 14 formed at the corners of the bottom 11. Where four rollers 13 are employed they are arranged in front and rear pairs; and the rollers of each pair are mounted on an axle l5 dlsposed transversely of the base. axle 15? prefhas a square cross-section and is proerabl vided at its ends with reduced sp ndles 16 upon which the rollers are fitted, said spindles providing shoulders 17 at the ends of the squared body of the axle and the rollers Q being confined between said shoulders and .cal guide lugs 18 an .the adjacent walls 12.

'The axles 15 are mounted for vertical movement within the base and are urged to their lowest positions relative to the base by springs 33, two of which are preferably provided for each axle and are located somewhat near the ends thereof, said springs preferably being of expansive spiral construction. The vertical movements of the axles 15 are positivel prescribed by verti- 19 provided at each end of the base, preferably in two groups or pairs, with a clearance 20 between the cooperating guide lugs of each pair; and the axles 15 are arranged in the clearances 20, their fitting in said clearances being such as to permit the requisite freedom of their vertical movement but as torevent any sensible horizontal play. 'In t e construction preferred the springs 33 are located between the co-operating iide lugs 18 and 19 which thus serve the a ditional function of controlling or aiding the action of saidsprings.

In the present embodiment the bottom 11 provides a means against which the axles 15 normally rest, said axles being pressed against said bottom 11 by the springs 33 thereby enabling the easy transportation of the jack or its easy manipulation under the object to be lifted, the operatin handle (not shown) preferably being used or such purposes. With the jack positioned for use, when the head'5 engages the axle or other object and its upward movement relative to the casing 2 is continued, the first effect of such engagement will be to depress the base relatively to the rollers 13 whereby the base comes into direct engagement with the floor or ground. The base has secure and stable engagement with the floor or ground by means of its walls 12 and, preferably also of its bottom 11 and when said walls or bottom or both engage the floor or ground, the supporting function is thereby transferred from the rollers 13 to the base, which latter insures the stability of the-jack throughout the operation of the head 5 or so long as said head bears the weight of the object to be lifted. lVhen the object supported by the jack is to be restored to its normal position, the head 5 is lowered in the ordinary manner and when the normal support for such object comes into operation so. that the weight is taken from the head 5, the springs 33, during the continuance of the downward movement of said head, raise the jack relatively to the rollers 13 which are thus once more projected below the bottom 11 and assume their normal jaclosuporting function. The jack may thereupon be freely moved to some other position.

In the constructions disclosed the gear 6 is housed within the base and the screw 1 has a step bearing against the bottom 11, its bearing portion being centered in a collar 21 secured to said bottom. It is desirable that the enclosed working parts be protected against any sensible accumulation of dust, and for this purpose the bottom 11 is imperforate, except for the clearances 14, and the lugs 18 adjoin the walls 12 at the ends of the base while the lugs 19 adjoin the walls 12 at the sides of the base, for this purpose being formed with transversely arranged extensions 22 which close the space between the transverse edges of the clearances 14 and the cover 10.

The features above described are common to both of the constructions shown.

Referring to Figures 1 to 6:

In this, the preferred construction, the lugs 18 and 19 are secured to, preferably cast with, the bottom 11 and strengthening ribs 23 extend between the lugs 19 and the collar 21. For the connection of the bottom 11, each wall 12 is provided on its inner face with a somewhat shallow centrally arranged lug 24 whose lower longitudinal edge is rounded or beveled, as at 25, and the bottom 11 is provided, centrally of each of its four sides, with a raised lug 26 having a beveled or rounded upper longitudinal edge 27 into position within the walls 12, the round- 1 ed or beveled edges 25 and 27 enabling the lugs 26 to be sprung past the lugs 24 and the latter projecting into the clearances 28 and engagm the lugs26 from below with supporting e ect, thereby firmly to sustain the bottom against the thrusts to which it is sub'ected. The cover 10 may be provided wit projections 29 which extend into the springs 33 and center them, the stability of sa1d s rings bein further insured by their pre erred location, as described, between the cooperating ln s 18 and 19 and by the flatness and extent 0 the upper face or side of the axle 15 against which said sprin s bear.

Re, erring to the construction shown in Fi ures7to9:

n this construction the .lugs 18 and 19 are secured to the cover 10 and the bottom 11 is secured in place against the lower faces of said lugs by fastening screws 30 for which the lugs 19 ma be provided with threaded recesses 31. or centering the springs 33 said cover is provided with sockets 32 in alinement with the clearances 26 between the cooperating lugs 18 and19.

Having fully described my invention, I claim v 1. A liftingjack having a base provided with co-operating guide lugs and clearances between the guide lugs, axles fitted in the clearances for vertical movement and each I provided with roller supporting means, said base including a cover which encloses said lugs, axles and roller supporting means and also having means secured below said lugs against which said axles may normally rest and springs acting within and on said cover and on said axles whereby to urge the latter downward relatively to said base, said roller supporting means normally projecting below said base and the latter being formed for stable engagement with the ground or floor to assume the supporting function under the weight of the object supported by the jack.

2. A lifting'jack having a base composed of a cover and bottom connected together in spaced relation and as companion elements, pairs of co-operating guide lugs secured to one of said companion elements, each pair of co-operating guide lugs having an intervening clearance, axles fitted in said clearances for vertical movement and each provided with roller supporting means, and springs acting on said axles to urge them downward relatively to the base, said axles normally resting against said bottom and the latter having clearances through which the roller supporting means normally project, said base being formed for sta le engagement with the ground or floor to assume the supporting function under the weight of the object supported by the-jack.

'3. A lifting jack having a base provided with co-operating guide lugs and clearances between the uide lugs, axles of square cross-section tted in the clearances for vertical movement and each provided with roller supporting means, said base also having means secured below said lugs against which said axlesma normally rest, expansive spiral springs tted in said clearances above said axles and urgin them downward relatively to said base, said roller supporting means normally rojecting below said base and the latter being formed for stable engagement with the ground or floor to "assume the supporting function under the weight of the'object supported by the jack.

4. A lifting jack having a base composed of a cover and bottom connected together in spaced relation as. companion elements and vertical walls extending between said elements, pairs of co-operating guide lugs secured to one of said companion elements, each pair of co-operating guide lugs having an intervening clearance, axles fitted in said clearances for vertical movement and each provided with roller supporting means, and

springs actin on said axles to urge them downward re atively to the base, said axles normally resting against said bottom and the latter having clearances through which the roller supporting means normally projects, certain of said lugs being formed with extensions adjacent the clearances in said bottom and between said companion elements to close the interior of said base, the latter being formed for stable engagement with the ground or floor to assume the supporting function under the weight of the object supported by the jack.

5. A lifting glack having a base composed of a cover an bottom connected together in spaced relation as companion elements and vertical walls extending between said elements, said bottom having corner clearances, supporting rollers normally operating through said clearances, transverse axles carrying said rollers, co-operating ately adjacent the respective vertical walls which bound said clearances, said base being formed for stable engagement with the ground or floor to assume the supporting function under the weight of the object supported by the jack.

6. A lifting jack having a base composed of a cover and bottom connected together in spaced relation as companion elements and vertical walls extending between said elements," said bottom having corner clearances, supporting rollers normally operating through said" clearances, transverse axles having reduced end spindles u on which said rollers are mounted, said splndles providing shoulders on said axles between which and the adjacent vertical walls said rollers are confined, cooperating guide In s between which the axles are fitted for vertical movement, and expansive spiral springs exerting thrust. against the cover and the axles to urge the axles downward relative to the base and into normal engagement with said bottom, said base being formed for stable engagement with the ground or floor to assume the supporting function under the weight of the objectsupported by the jack.

7. A lifting jack having a hollow base composed of a cover and bottom, said cover said raised lugs in which the first-named 30 lugs engage when the bottom is sprung into position within said vertical walls, and operating parts arranged internally of said base and exerting thrusts on said bottom.

In testimony whereof I have hereunto set 35 my hand in presence of two subscribing witnesses.

TRUE M. AVERY.

Witnesses:

ELIZABETH S. CovnLL, CLAUDE C. WEBB. 

